Preventive or remedy for bedsore

ABSTRACT

In accordance with the present invention, there are provided a preventive or of preventing or therapeutic agent for decubitus comprising an N-acylated derivative of hydroxyproline or a salt thereof; the above preventive or therapeutic agent wherein the N-acylated derivative of hydroxyproline or a salt thereof is contained in an amount of 0.1 to 15% by weight to the total weight; and the preventive or therapeutic agent for decubitus wherein the N-acylated group of the N-acylated derivative of hydroxyproline is an N-acylated group having 1 to 24 carbon atoms.

TECHNICAL FIELD

The present invention relates to a preventive or therapeutic agent fordecubitus.

BACKGROUND ART

Decubitus is a state of disease in which peripheral blood vessel of thetissue is clogged by oppression from contacting area of the bodyresulting in necrosis of the tissue and there are many cases where along period is needed for its cure.

Therefore, decubitus (the so-called bedsore) is apt to happen in agedpeople and patients under medical treatment for a long period who are onbed for long term and that is a big problem in nursing. In addition,decubitus is a disease which occurs in animals other than human being aswell and, for example, saddle sore of horses is also a kind ofdecubitus.

As a therapeutic agent for decubitus, ointment containing bromelain(Shinryo to Shinyaku, 1971, vol. 8, p. 967), ointment containingbucladesine sodium (Biological & Pharmaceutical Bulletin, 1995, vol. 18,p. 1539-1543), etc. have been used but all of them have been known tohave side effects such as bleeding and pain, and there has been a demandfor safer therapeutic agents for decubitus.

Moreover, in the conventional therapeutic agent for decubitus, there isno effect of preventing the generation of decubitus.

An agent for external application containing N-acetyl derivative ofhydroxyproline has been used in Europe as a therapeutic agent for wound.In addition, N-acetyl derivative of hydroxyproline has been known tohave a promoting action for ceramide synthesis (WO 02/6255), amoisturizing action, a suppressive action for aging and an improvingaction for skin quality (Japanese Published Unexamined PatentApplication 80321/2002) and a promoting action for collagen synthesis(WO 00/51561) but it has not been known yet to have a preventive andtherapeutic action for decubitus.

DISCLOSURE OF THE INVENTION

An object of the present invention is to provide a highly-safepreventive or therapeutic agent for decubitus.

The present invention relates to the following (1) to (9).

(1) A preventive or therapeutic agent for decubitus, which comprises anN-acylated derivative of hydroxyproline or a salt thereof.

(2) The preventive or therapeutic agent for decubitus according to theabove (1), wherein the N-acylated derivative of hydroxyproline or a saltthereof is contained in an amount of 0.1 to 15% by weight to the totalweight.

(3) The preventive or therapeutic agent for decubitus according to theabove (1) or (2), wherein an acyl group of the N-acylated derivative ofhydroxyproline is the acyl group having 1 to 24 carbon atoms.

(4) Use of an N-acylated derivative of hydroxyproline or a salt thereoffor the manufacture of a preventive or a therapeutic agent fordecubitus.

(5) The use of the N-acylated derivative of hydroxyproline or a saltthereof for the manufacture of a preventive or therapeutic agent fordecubitus according to the above (4), wherein the N-acylated derivativeof hydroxyproline or a salt thereof is contained in an amount of 0.1 to15% by weight to the total weight.

(6) The use of the N-acylated derivative of hydroxyproline or a saltthereof according to the above (4) or (5), wherein the acyl group ofN-acylated derivative of hydroxyproline is the acyl group having 1 to 24carbon atoms.

(7) A method of preventing or treating decubitus, which comprisesadministrating a composition comprising an N-acylated derivative ofhydroxyproline or a salt thereof.

(8) The method of preventing or treating decubitus according to theabove (7), wherein the composition contains 0.1 to 15% by weight of theN-acylated derivative of hydroxyproline or a salt thereof to the totalweight.

(9) The method of preventing or treating decubitus according to theabove (7) or (8), wherein the acyl group of the N-acylated derivative ofhydroxyproline is the acyl group having 1 to 24 carbon atoms.

An example of the acyl group of the N-acylated derivative ofhydroxyproline used in the present invention is a linear or branchedacyl group having 1 to 24 carbon(s) and its specific examples are formylgroup, acetyl group, propionyl group, butyl group, isobutyl group,valeryl group, pivaloyl group, hexanoyl group, heptanoyl group, octanoylgroup, nonanoyl group, decanoyl group, undecanoyl group, dodecanoylgroup and the like. Preferred examples are acetyl group, propionylgroup, butyl group and isobutyl group and the still more preferredexample is acetyl group.

With regard to N-acylated derivative of hydroxyproline used in thepresent invention, an N-acylated derivative of stereoisomer ofhydroxyproline may be also listed. As the stereoisomer ofhydroxyproline, mention may be made of cis-4-hydroxy-L-proline,cis-4-hydroxy-D-proline, cis-3-hydroxy-L-proline,cis-3-hydroxy-D-proline, trans-4-hydroxy-L-proline,trans-4-hydroxy-D-proline, trans-3-hydroxy-L-proline andtrans-3-hydroxy-D-proline.

As the salt of the N-acylated derivative of hydroxyproline, mention maybe made of alkaline metal salts such as sodium, potassium, lithium,etc., alkaline earth metal salts such as calcium, magnesium, etc.,ammonium salt, amine addition salt such as monoethanolamine,diethanolamine, triethanolamine, triisopropanolamine, etc. and basicamino acid addition salt such as arginine and lysine, etc.

The N-acylated derivative of hydroxyproline is able to be prepared by aknown method. For example, the N-acylated derivative of hydroxyprolineis able to be prepared in such a manner that a linear or branched andsaturated or unsaturated fatty acid having 1 to 24 carbon atoms isconverted to a halide such as chloride, bromide, etc. using ahalogenating agent such as thionyl chloride, phosgene, etc. and thencondensed with hydroxyproline or that fatty acid is converted to acidanhydride and then made to react with hydroxyproline.

With regard to the fatty acid, a fatty acid such as formic acid, aceticacid, propionic acid, butyric acid, isobutyric acid, valeric acid,isovaleric acid, pivalic acid, hexanoic acid, heptanoic acid, octanoicacid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid,etc. is used either solely or jointly.

A process for producing N-acylated derivative of hydroxyproline via anacid halide is exemplified as follows.

Fatty acid is dispersed in a solvent such as methylene chloride,chloroform, carbon tetrachloride, benzene, toluene, xylene, n-hexane,etc. and 1 to 5 equivalents of a halogenating agent is added theretofollowed by the reaction to give a fatty acid halide. Separately,hydroxyproline is dissolved or dispersed in a solvent and, during theresulting solution is kept at 5 to 70° C., the above fatty acid halideis added in an amount of 0.3 to 3.0 equivalent(s) to hydroxyproline toconduct an acylation reaction whereupon an N-acylated derivative ofhydroxyproline is produced.

As the solvent used for the acylation reaction, mentioned may be made ofwater, methanol, ethanol, isopropanol, isobutanol, acetone, toluene,tetrahydrofuran, ethyl acetate, N,N-dimethylformamide, dimethylsulfoxide and the like, and each of them may be used solely or jointly.In dissolving or dispersing hydroxyproline in a solvent, 0.8 to 2.0equivalents of alkaline substance such as sodium hydroxide, potassiumhydroxide, etc. may be dissolved or dispersed in a solvent if necessary.

In order to obtain a salt of the N-acyl derivative of hydroxyproline,the product itself may be purified when an N-acylated derivative ofhydroxyproline is prepared in a form of salt while, when it is preparedin a free form, it may be dissolved or suspended in an appropriatesolvent and a base is added thereto to form a salt.

With regard to purification, a conventional method such ascrystallization, chromatography, etc. may be used.

As the N-acylated derivative of hydroxyproline, mention may be made ofN-acetyl-cis-4-hydroxy-L-proline, N-acetyl-cis-4-hydroxy-D-proline,N-acetyl-cis-3-hydroxy-L-proline, N-acetyl-cis-3-hydroxy-D-proline,N-acetyl-trans-4-hydroxy-L-proline, N-acetyl-trans-4-hydroxy-D-proline,N-acetyl-trans-3-hydroxy-L-proline, N-acetyl-trans-3-hydroxy-D-proline,N-propionyl-cis-4-hydroxy-L-proline,N-propionyl-cis-4-hydroxy-D-proline,N-propionyl-cis-3-hydroxy-L-proline,N-propionyl-cis-3-hydroxy-D-proline,N-propionyl-trans-4-hydroxy-L-proline,N-propionyl-trans-4-hydroxy-D-proline,N-propionyl-trans-3-hydroxy-L-proline,N-propionyl-trans-3-hydroxy-D-proline,N-butyryl-cis-4-hydroxy-L-proline, N-butyryl-cis-4-hydroxy-D-proline,N-butyryl-cis-3 -hydroxy-L-proline, N-butyryl-cis-3-hydroxy-D-proline,N-butyryl-trans-4-hydroxy-L-proline,N-butyryl-trans-3-hydroxy-D-proline,N-butyryl-trans-3-hydroxy-L-proline,N-isobutyryl-cis-4-hydroxy-L-proline,N-isobutyryl-cis-4-hydroxy-D-proline,N-isobutyryl-cis-3-hydroxy-L-proline,N-isobutyryl-cis-3-hydroxy-D-proline,N-isobutyryl-trans-4-hydroxy-L-proline,N-isobutyryl-trans-4-hydroxy-D-proline,N-isobutyryl-trans-3-hydroxy-L-proline,N-isobutyryl-trans-3-hydroxy-D-proline, and the like.

The preventive or therapeutic agent for decubitus according to thepresent invention may include one or more N-acylated derivative(s) ofhydroxyproline or salt(s) thereof selected from the group consisting ofN-acylated derivatives of cis/trans-4-hydroxy-L/D-proline andcis/trans-3-hydroxy-L/D-proline and salts thereof.

The preventive or therapeutic agent for decubitus according to thepresent invention may be used as a composition of medicament, food ordrink, feed for animals, food additive, feed additive and the like and,preferably, it may be used as a medicament.

When the preventive or therapeutic agent for decubitus according to thepresent invention is used as a medicament, it is possible that theN-acylated derivative of hydroxyproline or a salt thereof which is anactive ingredient is administered solely, but it is usually preferred toadminister as a pharmaceutical preparation which is manufactured by anymethod which has been well known in the technical field ofpharmaceutical science by mixing the active ingredient with one or morepharmacologically acceptable carrier(s).

With regard to a method of administration, it is desirable to select themost effective method for prevention or treatment of decubitus. Theadministering method includes, for example, parenteral administrationsuch as application, subcutaneous, intramuscular, intravenous, oral,intra-airway and intrarectal administration, etc. as well as oraladministration and the like. Parenteral administration is preferred andapplication or subcutaneous administration is more preferred. As thedosage form, mention may be made of ointment, tape, spray, injection.,suppository, capsule, tablet, granule, syrup, emulsion and the like.

As the pharmaceutical preparation suitable for parenteral administrationof the preventive or therapeutic agent according to the presentinvention, mention may be made of agents for external application,injection and suppository and, an agent for external application is morepreferred.

With regard to the form of the agent for external application, there isno particular limitation so far as it contains N-acylated derivative ofhydroxyproline or a salt thereof and a base and is in a form which isapplicable to the diseased area and its examples include liquid,aerosol, cream, gel (jelly), powder, ointment, poultice and liniment.Liquid, aerosol, cream, gel, ointment, poultice, etc. are preferred.

Depending upon its form, the agent for external application may beprepared using a commonly used base such as oily base or hydrophobicbase, emulsion-type base, hydrophilic base or water-soluble base, gelbase, etc. and a commonly used component such as surfactant, fatty acidor derivative thereof, ester of polycarboxylic acid with alcohol, higheralcohol, suspending agent or thickener, powder/granular inorganicsubstance, gel-forming substance, water, alcohol, polyhydric alcohol,alkanolamine, buffer, propellant and the like.

Examples of components for oily base or hydrophobic base are Vaseline,liquid paraffin, paraffin wax, plasti-base containing liquid paraffinand polyethylene, silicone oil, triglyceride, squalene, beeswax,bleached beeswax, microcrystalline wax, paraffin wax, whale wax andother wax and pure lanoline. Examples of components for emulsion-typebase are oily base such as Vaseline, lanoline, etc., higher alcohol,surfactant, emulsifier and the like. As the emulsifier, mention may bemade of nonionic and anionic surfactants, cholesterol, higher alcohol,free fatty acid derived from plant oil and the like.

Examples of components for hydrophilic base or water-soluble base arehydrophilic fatty acid ester such as glycerol ester of saturated fattyacid (for example, Adeps solidus and the like) and water-soluble polymersuch as polyethyleneglycol (for example, Macrogol, etc.) and the like.

Examples of components of gel base are organic hydrogel base such ascolloid-dispersed starch, tragacanth, alginate, cellulose derivative(for example, methyl cellulose, carboxymethyl cellulose, carboxymethylcellulose sodium, etc.), etc., and inorganic hydrogel base containingcolloidal clay (for example, silicates such as bentonite, Veegum, etc.)and the like.

As the surfactant, mention may be made of natural emulsifier such as gumacacia, gelatin, tragacanth, lecithin cholesterol, etc. anionicsurfactants such as soap and sodium alkyl sulfate, nonionic surfactantsuch as polyoxyethylene sorbitan fatty acid ester (for example,monooleyl polyoxyethylene sorbitan, etc.), polyoxyethylene castor oilderivative, polyoxyethylene hydrogenated castor oil, glycerol fatty acidester (for example, glycerol monostearate, sorbitan monooleate, etc.),sorbitan fatty acid ester (for example, sorbitan-monostearate andsorbitan sesquistearate), polyoxyethylene higher alcohol ether (forexample, polyoxyethylene cetyl ether, etc.), polyoxyethylene alkylphenol, polyoxyethylene oxypropylene copolymer (for example, Pluronic,etc.) and the like, cationic surfactants such as cetyl trimethylammoniumchloride, etc., amphoteric surfactant and the like.

As the fatty acid or derivative thereof, mention may be made of higherfatty acids such as oleic acid, stearic acid, etc., and a salt thereof;ester of higher fatty acid such as caprylic acid, caproic acid, myristicacid, palmitic acid, stearic acid, oleic acid, etc. with monohydricaliphatic alcohol (for example, isopropyl myristate, isopropylpalmitate, isopropyl stearate, decyl oleate, etc.); triglycerides suchas caprylic acid triglyceride, caproic acid triglyceride, peanut oil,castor oil, cacao oil and hydrogenated fat/oil (for example,hydrogenated castor oil, etc.) and the like; and fatty acid ester ofpolyhydric alcohol such as pentaerythritol -fatty acid ester, etc.

As the ester of polycarboxylic acid with alcohol, mention may be made ofester of polycarboxylic acid such as adipic acid and sebacic acid withmonohydric aliphatic alcohol (for example, ethyl adipate, diisopropyladipate, etc.) and the like.

As the higher alcohol, mention may be made of benzyl alcohol, laurylalcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearylalcohol, 2-octyldodecanol, etc.

As the suspending agent and thickener, mentioned may be made ofpolysaccharides such as gum acacia, tragacanth, pullulan, locust beangum, bean gum, pectin, xanthan gum, guar gum, etc., methyl cellulose,carboxymethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone,acrylic acid copolymer, carboxyvinyl polymer, colloidal microcrystallinecellulose and the like.

As the powdery/granular inorganic substance, mention may be made oftalc, silicic acid anhydride, calcium carbonate, magnesium carbonate,colloidal silica, bentonite, etc.

As the gel-forming substance, mention may be made of polyacrylic acid,polymethacrylic acid or salt thereof, highly water-absorbing resin suchas cross-linked polyvinyl alcohol, carboxymethyl cellulose sodium, gumacacia, xanthan gum and guar gum.

The alcohol includes, for example, ethanol, isopropanol and the like.

The polyhydric alcohol includes, for example, ethylene glycol,diethylene glycol, propylene glycol, dipropylene glycol, tripropyleneglycol, 1,3-tetramethylene glycol, glycerol, sorbitol and the like.

The alkanolamine includes, for example, diethanolamine triethanolamineand the like.

The buffer includes, for example, citrate, malate, acetate, phosphate,polar amino acid, sodium hydroxide and the like.

As the component for propellant, mention may be made of low-boilingfluorinated hydrocarbon (such as CFC 22), aliphatic hydrocarbon (such aspropane, butane, etc.) and the like.

For external application, if necessary, other additive such aspreservatives, e.g. p-hydroxybenzoate ester(for example, methylp-hydroxybenzoate, propyl p-hydroxybenzoate, etc.), stabilizer, e.g.,antioxidants (for example, butylhydroxytoluene, etc.), coloring agentsand fragrance-giving agents may be added to the agent.

When the agent for external application is liquid, it is also possibleto use surfactants and emulsifiers and, if necessary, higher fatty acidester, higher alcohol, suspending agenst or thickeners, alcohols,polyhydric alcohols, preservative, etc. In an aerosol agent, apropellant is used together with the above components for liquidpreparation and, if necessary, it is also possible to use a solvent suchas ethanol, glycerol, propylene glycol, etc., higher fatty acid ester,surfactants and the like.

The gel preparation contains a gel-forming agent and, with regard to abase for cream and ointment, the above-mentioned oily base orhydrophobic base, emulsion-type base, hydrophilic base or water-solublebase and gel base are used.

The powdery preparation may be prepared by using excipients such aslactose, starch, etc., binder disintegrating agents and otherappropriate additives.

With regard to the component of base for poultice, Japanese PublishedUnexamined Patent Application 105630/1993 may, for example, be referredto and its examples are rubber components such asstyrene-isoprene-styrene block copolymer and styrene-isoprene-styreneblock copolymer, etc., tackiness-giving agents, oil components,water-soluble polymer and water-absorbing polymer, water andantioxidants.

In the liniment, it is possible to use oil emulsion such as fat oil,soap, gum acacia, tragacanth, etc., and alcohol soap and the like, andif necessary, glycerol, carmellose sodium, etc. may be used as well.

The above-mentioned base and the above-mentioned component in thosepreparations may be appropriately selected depending upon the type ofthe preparation and the amount thereof may also be appropriatelyselected within a range which is usually used in the preparation.

The agent for external application may be applied by, for example, meansof application, inunction or spraying depending upon dosage form, etc.Applying amount of the agent for external application to the diseasesarea may be selected by, for example, amount of the active ingredient.Thus, for example 0.02 to 100 mg, preferably 0.2 to 20 mg or,particularly preferably, 2 to 10 mg is applied per cm² of the diseasedare a per day once to about three times daily. Although there is noparticular limitation for the period of administration, it is usuallyfrom one day to one year and, preferably, from one week to three months.

The amount of N-acylated derivative of hydroxyproline or a salt thereofcontained in the above preparation is 1 to 1,000 mg, preferably 1 to 500mg or, more preferably, 1 to 200 mg in 1 g of the above preparation.

Injection preparation is prepared using a carrier, etc. comprising asalt solution, a glucose solution or a mixture thereof. Suppository isprepared using a carrier such as cacao butter, hydrogenated fat,carboxylic acid, etc.

Examples of preparations suitable for oral administration are tablet,diluted powder, granule, emulsion, syrup, capsule, etc. When the dosageform of the oral preparation is tablet, diluted powder, granule, etc.,it is possible to prepared the preparation by addition of excipientssuch as saccharide (for example, lactose, sugar, glucose, sucrose,mannitol, sorbitol, etc.), starch (for example, that of potato, wheat,corn, etc.), inorganic substance (for example, calcium carbonate,calcium sulfate, sodium hydrogen carbonate, sodium chloride, etc.) andplant powder (for example, licorice powder, gentian powder, etc.),disintegrating agents such as starch, agar, gelatin powder, crystallinecellulose, carmellose sodium, carmellose calcium, calcium carbonate,sodium hydrogen carbonate, sodium alginate, etc., lubricants such asmagnesium stearate, talc, hydrogenated plant oil, Macrogol, siliconeoil, etc., binders such as polyvinyl alcohol, hydroxypropyl cellulose,methyl cellulose, ethyl cellulose, carmellose, gelatin, starch pastesolution, etc., surfactants such as fatty acid ester, plasticizer suchas glycerol, etc. and the like.

When the dosage form of the oral preparation is liquid preparation suchas syrup, etc., it is able to prepare the preparation by adding water,saccharides such as sucrose, sorbitol, fructose, etc., glycols such aspolyethylene glycol, propylene glycol, etc., oils such as sesame oil,olive oil, soybean oil, etc., antiseptics such as p-hydroxybenzoateester, etc., flavors such as straw berry flavor, peppermint, etc. andthe like.

Although dose of the above-mentioned injection and oral preparation tohuman being varies depending upon dosage form, degree of symptom, ageand body weight of a patient, etc., it is usually 0.02 to 100 mg,preferably 0.2 to 20 mg or, particularly preferably, 2 to 10 mg per kgbody weight of human being per day. Although there is no particularlimitation for the period for administration, it is usually from one dayto one year and, preferably, from one week to three months.

Amount of the N-acylated derivative of hydroxyproline or a salt thereofcontained in the above preparation is 1 to 1,000 mg, preferably 1 to 500mg or, more preferably, 1 to 150 mg per g of the preparation.

Incidentally, in the present invention, “prevention of decubitus” meansthat, by way of usual administration or ingestion of the preventiveagent for decubitus of the present invention, the effect such as (a)complete prevention of decubitus, (b) reduction in incidence rate or (c)suppression of symptom upon onset is achieved.

The preventive agent or the treating agent for decubitus according tothe present invention is able to be used not only for human being butalso for animals except human being. Examples of the animals excepthuman being are dog, cat, cattle, horse, etc.

Although the dose of the preventive or therapeutic agent for decubitusaccording to the present invention varies depending upon dosage form,type of the animal to which the agent is administered, age and bodyweight of the animal, etc., it is usually 0.02 to 100 mg, preferably 0.2to 20 mg or, particularly preferably, 2 to 10 mg per kg body weight ofthe animal per day. Although there is no particular limitation for theadministering period, it is usually one day to one year or, preferably,from one week to three months.

When the preventive or therapeutic agent for decubitus according to thepresent invention is used as food or drink, a product where theN-acylated derivative of hydroxyproline or a salt thereof is added tofood or drink is able to be used as food or drink for prevention ortreatment of decubitus.

The food or drink as such is able to be processed/prepared by a commonmethod for the manufacture of food or drink except addition of theN-acylated derivative of hydroxyproline or a salt thereof.

When the preventive or therapeutic agent for decubitus is used for foodor drink, its form may be any of juice, refreshing drink, tea, lacticacid bacteria beverage, milk product such as fermented milk, ice cream,butter, cheese, yogurt, processed milk, skim milk, etc., meat productsuch as ham, sausage, hamburger, etc., fish meat paste product such askamaboko, chikuwa, Satsuma-age, etc., egg product such as dashi-maki,steamed egg custard, etc., confectionery such as cookie, jelly, chewinggum, candy, snack, etc., bread, noodle, pickles, smoked product, driedproduct, tsukudani, salted product, soup, seasoning, etc.

Form of the food or drink may also be any of powdery food, sheet-shapedfood, bottled food, canned food, retort food, capsule food, food ordrink in a tablet form, fluid food, drink, etc.

The preventive or therapeutic agent for decubitus according to thepresent invention may also be used as health food or functional foodhaving an effect of preventing or treating decubitus.

When the food or drink is a beverage or a tablet, it is prepared by sucha manner that other components, additive, etc. are added, if necessary,to the N-acylated derivative of hydroxyproline or a salt thereoffollowed by dissolving or dispersing in an appropriate amount of wateror making into tablets. In the case of confectionery such as candy,drop, chocolate, jelly, biscuit, cookie, etc., other components,additive, etc. are added to the N-acylated derivative of hydroxyprolineor a salt thereof and, further necessary, an appropriate carrier such aswheat flour, rice flour, starch, corn starch, soybean, etc. is addedthereto followed by making into an appropriate shape by a conventionalmethod to give a product.

The above food or drink may also be prepared by means of a granulatingmethod such as fluidized bed granulation, stirring granulation,extrusion granulation, tumbling granulation, air current granulation,compression molding granulation, disintegration granulation, spraygranulation, jet granulation, etc., a coating method such as pancoating, fluidized bed coating, dry coating, etc., a swelling methodsuch as puff dry, excessive steam method, foam mat method, microwaveheating method, etc., an extrusion method such as extrusion granulation,extruder, etc. and the like.

When the preventive or therapeutic agent for decubitus according to thepresent invention is used as a food additive, such a food additive isable to be prepared by the same method as in the case of theabove-mentioned oral administration. Usually, the food additive is mixedwith or dissolved in other food additive and processed/produced into aform of, for example, powder, granule, pellet, tablet or various liquidpreparations.

Food additive which is commonly used for food or drink such assweetener, coloring agent, preservative, thickener/stabilizer,antioxidant, color coupler, bleaching agent, antifungal agent, gum base,bitter agent, enzyme, brightener, acidifying agent, seasoning,emulsifier, enriching agent, agent for manufacture, flavoringingredient, spice extract, etc. may be added to the above-mentioned foodor food additive.

Adding amount of the N-acylated derivative of hydroxyproline or a saltthereof or a food additive to the above-mentioned food or drink isappropriately selected depending upon type of food or drink, effectexpected by ingestion of the food or drink, etc. and, as the N-acylatedderivative of hydroxyproline or a salt thereof, it is usually added soas to make its content 0.1 to 100% by weight, preferably 0.1 to 50% byweight or, more preferably, 0.1 to 15% by weight.

Ingesting amount of the above-mentioned food or drink varies dependingupon ingesting form, age and body weight of the person who ingests it,etc., it is usually 0.02 to 100 mg, preferably 0.2 to 20 mg or,particularly preferably, 2 to 10 mg as the N-acylated derivative ofhydroxyproline or a salt thereof per day for an adult and it is ingestedonce or several times a day. Although there is no particular limitationfor the ingesting period, it is usually from one day to one year or,preferably, from one week to three months.

When the food or drink is routinely ingested, decubitus is able to beprevented.

When one is attacked with decubitus already, the food or drink isroutinely ingested whereby decubitus is able to be treated such as thatsymptom of decubitus is alleviated or cured.

When the preventive or therapeutic agent for decubitus according to thepresent invention is used as a feed for animals, a product prepared byaddition of the N-acylated derivative of hydroxyproline or a saltthereof to the feed for animals may be used as a feed for animals forprevention or treatment of decubitus. Such a feed for animals is able tobe processed/produced by a common manufacturing method for feed.

With regard to the feed for animals, any feed may be used as far as itis a feed having a preventive effect for decubitus of animals excepthuman being and its examples are feed for pets such as dogs, cats,.etc., pet food, feed for cattle, horse, etc. and the like.

Such a feed for animals is able to be used as a supplementary food forhealth of animals having an effect of preventing or treating ofdecubitus.

Examples of the feed are cereals, chaff and bran, plant oil cake, feedderived from animals and other feed, purified product, a mixturethereof, etc.

Examples of cereals are milo, wheat, barley, oat, rye, unpolished rice,buckwheat, foxtail millet, broomcorn millet, Japanese millet, corn,soybean, etc.

Examples of chaff and bran are rice bran, defatted rice bran, wheatbran, rice flour, wheat, embryo, barley bran, pellet, corn bran, cornembryo, etc.

Examples of plant oil cake are soybean oil cake, soybean flour, linseedoil cake, cottonseed oil cake, peanut oil cake, safflower oil cake,coconut oil cake, palm oil cake, sesame oil cake, sunflower oil cake,rapeseed oil cake, kapok oil cake, mustard oil cake, etc.

Examples of feed derived from animals are fish powder such as Northernocean meal, imported meal, whole meal, etc., coast meal, fish soluble,meat powder, meat bone powder, blood powder, degraded hair, bone powder,side product upon treatment of animals, feather meal, chrysalis of silkworm, skim milk, casein, dry whey, etc.

Examples of other feed are plant stems/leaves such as alf alfa, haycube, alfalfa leaf meal, black locust powder, etc, side products in cornprocess industry such as corn gluten, meal, corn gluten feed, corn steepliquor, etc., processed starch such as starch, etc., fermentationindustry product such as yeast, beer cake, malt root, alcohol cake, soysauce cake, etc., side product in agricultural manufacture such as cakeafter processing of citrus fruits, soybean curd cake, coffee grounds,cocoa grounds, etc., cassava, broad bean, guar meal, sea algae, krill,spirulina, chlorella, minerals, etc.

Examples of pure product are protein such as casein, albumin, etc.,amino acid, starch, cellulose, saccharide such as sucrose, glucose,etc., minerals, vitamins and the like.

The above-mentioned feed for animals is also able to be produced by agranulation method such as fluidized bed granulation, stirringgranulation, extrusion granulation, tumbling granulation, air currentgranulation, compression molding granulation, disintegratinggranulation, spray granulation, jet granulation, etc., coating methodsuch as pan coating, fluidized bed coating, dry coating, etc., swellingmethod such as puff dry, excessive steam method, foam mat method,microwave heating method, etc., extrusion method such as extrusiongranulator, extruder, etc. and the like.

Feed additive may be prepared by the same method as that for the oralpreparation. Feed additive is usually mixed with or dissolved in otherfeed additive if necessary and is processed/produced in the form of, forexample, powder, granule, pellet, tablet and various liquidpreparations.

Amount of N-acylated derivative of hydroxyproline or a salt thereofcontained in the feed for animals varies depending upon ingesting mode,type of the animal ingesting it, age, body weight, etc. of the animaland, usually, it is added so as to make the daily ingesting amount 0.02to 100 mg, preferably 0.2 to 20 mg or, particularly preferably, 2 to 10mg per kg body weight of the animal to be administered.

The feed for animals is ingested once or several times a day. It is alsopossible that the feed additive of the present invention is administeredas an oral preventive or therapeutic agent for animals for decubituswhere the ingesting animal is a subject in the same dose andadministering period as the ingesting amount and ingesting period forthe above-mentioned feed.

When the feed for animals is routinely administered to animals,decubitus is able to be prevented.

When decubitus is already noted, the feed for animals is routinelyadministered whereby decubitus is able to be treated.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a drawing which shows a balloon pressure apparatus.

FIG. 2 is a drawing which shows a tissue image of the site to which abase is applied. At the site to which an arrow shows, denatured necrosisimage of cutaneous muscle is noted.

FIG. 3 is a drawing which shows a tissue image of the site to which anN-acetylhydroxyproline preparation was applied.

FIG. 4 is a drawing which shows an increase/decrease, ratio of watercontent in horny layer of the skin in the site applied with a base creamor an AHYP cream in the waist of rabbit of malnutrition. In the drawing,black columns and open columns are test groups to which a base cream andan AHYP cream were applied, respectively. An ordinate shows anincreasing. rate (%) to the water content in the horny layer of the skinbefore application of the cream while an abscissa shows elapsed daysfrom initiation of application of the cream.

BEST MODE FOR CARRYING OUT THE INVENTION

The examples of the invention are described below.

EXAMPLE 1 Preventive Effect of the N-acylated Derivative ofHydroxyproline to Decubitus (1)

A glycerol preparation containing 10% by weight of theN-acetylhydroxyproline (hereinafter, referred to as the AHYPpreparation) and a glycerol preparation containing noN-acetylhydroxyproline (control preparation; hereinafter, referred to asthe base) were prepared by a conventional method. Compositions of theAHYP preparation and of the base are shown in Table 1. In Table 1, theterm “q.s.” means an amount of sodium hydroxide added necessary formaking the pH of the AHYP preparation or glycerol preparation 5.99 andthe term “balance” means an amount of purified water added necessary formaking 100% by weight as a preparation by addition of purified water tothe total amount of components other than purified water. TABLE 1 AHYPPreparation Names of Components (% by weight) Base (% by weight)N-Acetylhydroxyproline 10 0 Glycerol 30 30 Citric acid 0.3 0.3 Sodiumhydroxide q.s. q.s. Purified water balance balance Total 100 100 pH 5.995.99 Property transparent transparent

In the animal experiment, 3 healthy male rabbits of Japanese whitespecies (purchased from Kitayama Rabesu) were used. Body weight of theanimals used for the experiment was 3,200 to 3,500 g.

Dorsolumbar skin of the rabbits was clipped by an electric hair clipper(DC5, manufactured by Shimizu Denki Kogyo) and depilated using adepilating cream [Dibale (registered trade mark), manufactured byShiseido Cosmenity]. After that, 0.2 ml of the AHYP preparation wasapplied to the skin on right iliac wing of about 30 cm² twice daily forcontinued four days. A base was similarly applied to the skin on leftiliac wing of the same animal. During the above period, redness, etc. ofthe skin to which application was conducted were observed by naked eye.On the next day after completion of the application, oppression wasapplied for 24 hours to the skin to which the test substance was appliedso as to result in light decubitus. The tested sites were observed bynaked eye and photographic pictures were taken immediately after removalof oppression and after 24 hours therefrom. After 24 hours from removalof oppression, the oppressed skin was excised and fixed with a 20%neutral buffer formalin solution (manufactured by Wako Pure Chemical).

The excised oppressed skin was fixed for 5 days with the formalinsolution and then cut out in stripes to prepare pathological specimens.Incidentally, the tissue specimens were prepared at the HistologicalScience Laboratory (984-1, Kurosawa-4-chome, Ohme-shi, Tokyo).

When the oppressed skin was observed, no skin irritation such as rednesswas noted on the skin by application of the test substance.

Immediately after removal of oppression by a balloon, a light rednesswas noted in the case of application of any of the AHYP preparation andthe base. After 24 hours from removal of oppression, the rednessdisappeared.

When the site to which a base was applied was subjected to ahistological test, denaturation/necrosis image of cutaneous skin wasobserved together with limited wound image of epidermis (FIG. 2). On theother hand, in the histological test of the site to which the AHYPpreparation was applied, although the wound image of epidermis was notedas well, denaturation/necrosis image of cutaneous skin was not noted(FIG. 3). Thus, it was confirmed that, in the lesion to which the AHYPpreparation was applied, degree of wound was weak as compared with thecontrol lesion to which the base was applied.

From the above result, it was found that the N-acylated derivative ofhydroxyproline had a preventive effect for decubitus.

EXAMPLE 2 Preventive Effect of the N-acylated Derivative ofHydroxyproline to Decubitus (2)

A preventive effect of the N-acylated derivative of hydroxyproline fordecubitus was tested using rabbits in which malnutrition was induced(hereinafter, referred to as rabbits of malnutrition) which is one ofthe causes for resulting weak skin.

The rabbits of malnutrition were prepared by breeding of three malehealthy rabbits of Japanese white species having body weight of 3,200 to3,500 g for 15 days to which tap water was freely given but no feed wasgiven. Body weight of rabbits of malnutrition decreased to an extent ofabout 20% as compared with before fasting. In a hematobiochemical test,both total protein in serum and albumin in serum decreased from 6.4 g/dlin average to 5.2 g/dl in average and from 4.4 g/dl in average to 3.2g/dl in average, respectively as compared with before fasting.

A cream containing 10% by weight of the N-acetylhydroxyproline(hereinafter, referred to as the AHYP cream) and a cream containing noN-acetylhydroxyproline (hereinafter, referred to as the base cream) wereprepared by a conventional method. Compositions of the AHYP cream andthe base cream are shown in Table 2. Incidentally, in Table 2, the term“q.s.” means the adding amount of purified water necessary for makingthe total amount of the preparation 100% by weight. TABLE 2 Base CreamAHYP Cream Names of Components (% by weight) (% by weight)N-Acetylhydroxyproline 0 10 Emulsifier 1.0 1.0 Polyhydric alcohol fattyacid ester 1.9 1.9 Oily base 18.0 18.0 Polyhydric alcohol 13.5 13.5Thickener 0.1 0.1 Antiseptic (Paraben) 0.2 0.2 Buffer 1.8 3.7 Purifiedwater q.s. q.s. Total Amount 100

Dorsolumbar skin of the rabbits of malnutrition were depilated, onecircular site of 4 cm diameter was secured on iliac wing at the leftwaist and 40 mg of the AHYP cream was applied thereto twice daily nearlyat the same time for continued four days. At the right waist, a basecream was applied in the same proceeding as in the case of the leftwaist. In order to check the moisturizing effect, water content of thehorny layer of the skin to which the above was applied was measured oncedaily using a moisture checker (Skin Moisture Meter MY-707S;manufactured by K. K. Scala) and averaged for each cream and degree ofincrease/decrease to the state before application and change in dayswere recorded. On the fifth day from the start of the experiment,oppression was added to the skin to which cream was applied to prepare alight decubitus using a balloon pressure apparatus by the same method asmentioned in Example 1. After that, the oppressed skin was excised and ahistological test was conducted.

(1) Moisturizing Effect

Changes in water content at horny layer of the skin at the waist of therabbits are shown in FIG. 4. At the site where the base cream wasapplied, a significant increasing rate was noted after 3 days fromapplication of the cream while, on the fourth day, a decrease was noted.On the contrary, at the site where the AHYP cream was applied, anincrease of around 9% was noted from the second day after application ofthe cream and that was maintained until the fourth day.

(2) Histological Test

The site where the AHYP cream was applied, degree of wound of epidermisof the oppressed site was light as compared with the site where the basecream was applied.

From the above results, it was noted that the N-acylated derivative ofhydroxyproline has a preventive effect for decubitus in rabbits ofmalnutrition which is a pathological model of decubitus.

EXAMPLE 3 Therapeutic Effect of the N-acylated Derivative ofHydroxyproline for Decubitus

A therapeutic effect of the N-acylated derivative of hydroxyproline fordecubitus was measured using saddle sore of horses as an subject.

An ointment containing 2.5% by weight of the N-acetylhydroxyproline wasprepared by the following method. Incidentally, in Table 3, the term“balance” means an adding amount of purified water necessary for making10% as the preparation when purified water was added to the total amountof components other than pure water. TABLE 3 Compounding Content byNames of Components weight (%) A Stearic acid 5.0 Cetanol 2.0 Cetylpalmitate 2.0 Trimethylolpropane trioctanoate 10.0 Adsorbed pure lanolin3.0 Liquid paraffin 5.0 Self-emulsified glycerol monostearate 0.5Polyoxysorbitan monostearate 3.0 B Methyl paraben 0.15 1,3-Butyleneglycol 7.0 N-Acetylhydroxyproline 2.5 Triethanolamine 2.7 Purified waterbalance Total 100

The compounds listed in the column A of the above Table 3 were mixed andheated to dissolve at 80° C. (hereinafter, referred to as layer A).Separately, the compounds listed in the column B of the above Table 3were mixed and heated to dissolve at 80° C. (hereinafter, referred to aslayer B). The layer B was gradually poured into the layer A which wasbeing stirred and a stirring at a medium speed was continued during 5minutes after completion of pouring of the layer B. After that, thereaction solution was cooled with a low-speed stirring and the stirringwas stopped when the temperature of the reaction solution reached 35° C.to finish the reaction.

An ointment in which 2.5% by weight of the N-acetylhydroxyproline wascompounded prepared hereinabove was applied for three weeks to the siteof saddle score of Thoroughbred horse of seven years age where necrosiswas noted at the lesion due to saddle score.

As a result, diseased area of the saddle score decreased and necrosiswas treated even to an extent that proud flesh was generated and lanugowas formed. Incidentally, in the control test section to which anointment comprising the components listed in Table 3 where noacetylhydroxyproline was contained, treating of saddle score was notnoted.

From the above, it was confirmed that the N-acetylated derivative ofhydroxyproline is effective for the treatment of oppressive necrosis.

EXAMPLE 4 Tablets Containing the N-acetylated Derivative ofHydroxyproline

Tablets (200 mg per tablet) were prepared by a conventional methodaccording to the formulation mentioned in Table 4. TABLE 4 Names ofComponents Amount (mg) N-Acetylhydroxyproline 50 Lactose 90 Corn starch30 Synthetic aluminum silicate 12 Carboxymethyl cellulose calcium 15Magnesium stearate 3

EXAMPLE 5 Diluted Powder Containing the N-acetylated Derivative ofHydroxyproline

Diluted powder (550 mg per pack) was prepared according to theformulation mentioned in Table 5. TABLE 5 Names of Components Amount(mg) N-Acetylhydroxyproline 50 Lactose 300 Corn starch 200

EXAMPLE 6 Hard Capsule Preparation Containing the N-acetylatedDerivative of Hydroxyproline

Hard capsule preparation (160 mg per capsule) was prepared according tothe formulation mentioned in Table 6. TABLE 6 Names of Components Amount(mg) N-acetylhydroxyproline 50 Lactose 60 Corn starch 30 Hydroxypropylcellulose 20

Lactose (60 mg) and 30 mg of corn starch were added to and mixed with 50mg of hydroxyproline and an aqueous solution of 20 mg of hydroxypropylcellulose followed by kneading. After that, granules were prepared by aconventional method using an extrusion granulator. The granules werefilled in gelatin hard capsule to prepare a hard capsule preparation.

EXAMPLE 7 Soft Capsule Preparation Containing the N-acetylatedDerivative of Hydroxyproline

Soft capsule preparation (170 mg per capsule) was prepared according tothe formulation mentioned in Table 7. TABLE 7 Names of Components Amount(mg) N-Acetylhydroxyproline 50 Soybean oil 120

Hydroxyproline (50 mg) was added to and mixed with 120 mg of soybeanoil. After that, the mixture was filled in soft capsules by aconventional method using a rotary soybean automated shaping machine toprepare soft capsules.

EXAMPLE 8 Refreshing Drink Containing the N-acetylated Derivative ofHydroxyproline

Refreshing drink (for 10 bottles) was prepared according to thecompounding mentioned in Table 8. TABLE 8 Names of Components Amount (g)N-Acetylhydroxyproline 5 Vitamin C 1 Vitamin B₁ 5 Vitamin B₂ 10 VitaminB₆ 25 Liquid sugar 150 Citric acid 3 Flavoring ingradient 1

Water was added to make 1,000 ml.

EXAMPLE 9 Cookie Containing the N-acetylated Derivative ofHydroxyproline

Cookies (for 30 cookies) were. prepared according to the compoundingmentioned in Table 9. TABLE 9 Names of Components AmountN-Acetylhydroxyproline 1.5 g  Soft wheat flour 100 g  Starch 74 g Water14 g Baking powder 2 small tablespoonful Salt ½ small tablespoonful Eggone Butter 80 g Milk 2 large tablespoonful Honey a little

INDUSTRIAL APPLICABILITY

In accordance with the present invention, there is provided a preventiveor therapeutic agent for decubitus comprising an N-acetylated derivativeof hydroxyproline or a salt thereof.

1. A preventive or therapeutic agent for decubitus, which comprises an N-acylated derivative of hydroxyproline or a salt thereof.
 2. The preventive or therapeutic agent for decubitus according to claim 1, wherein the N-acylated derivative of hydroxyproline or a salt thereof is contained in an amount of 0.1 to 15% by weight to the total weight.
 3. The preventive or therapeutic agent for decubitus according to claim 1 or 2, wherein an acyl group of the N-acylated derivative of hydroxyproline is the acyl group having 1 to 24 carbon atoms.
 4. Use of an N-acylated derivative of hydroxyproline or a salt thereof for the manufacture of a preventive or therapeutic agent for decubitus.
 5. The use of the N-acylated derivative of hydroxyproline or a salt thereof for the manufacture of a preventive or therapeutic agent for decubitus according to claim 4, wherein the N-acylated derivative of hydroxyproline or a salt thereof is contained in an amount of 0.1 to 15% by weight to the total weight.
 6. The use of the N-acylated derivative of hydroxyproline or a salt thereof according to claim 4 or 5, wherein the acyl group of N-acylated derivative of hydroxyproline is the acyl group having 1 to 24 carbon atoms.
 7. A method of preventing or treating decubitus, which comprises administering a composition comprising an N-acylated derivative of hydroxyproline or a salt thereof.
 8. The method of preventing or treating decubitus according to claim 7, wherein the composition contains 0.1 to 15% by weight of the N-acylated derivative of hydroxyproline or a salt thereof to the total weight.
 9. The method of preventing or treating decubitus according to claim 7 or 8, wherein the acyl group of N-acylated derivative of hydroxyproline is the acyl group having 1 to 24 carbon atoms. 